The **SERIESSUM** function is one of the math and trigonometry functions. It is used to return the sum of a power series. based on the following power series expansion:

**Syntax**: =SERIESSUM( x, n, m, coefficients )

The SERIESSUM function syntax has the following arguments:

x | – | The input value to the power series. |

n | – | The first power to which x is to be raised. |

m | – | The step size that n is increased by, on each successive power of x. |

coefficients | – | An array of coefficients that multiply each successive power of x. |

**Example**: Let’s look at some Excel SERIESSUM function examples and explore how to use the SERIESSUM function as a worksheet function in Microsoft Excel:

In the spreadsheet below, the Excel Seriessum function is used to calculate the power series:

**Syntax**: =SERIESSUM(5,1,1,{1,1,1,1,1})

**Result**:

Based on the Excel spreadsheet above, the following SERIESSUM examples would return:

**Syntax**: =SERIESSUM(7,1,1,{1,1,1,1,1})

**Result**: 19607

**Syntax**: =SERIESSUM(12,1,1,{1,1,1,1,1})

**Result**: 271452

**Syntax**: =SERIESSUM(2,1,2,{1,2,3,4,5})

**Result**: 3186

**Syntax**: =SERIESSUM(4,1,3,{1,3,5,7,9})

**Result**: 611402500

**Syntax**: =SERIESSUM(3,1,4,{1,2,3,4,5})

**Result**: 652137645

**Syntax**: =SERIESSUM(3,1,1,{1,1,1,1})

**Result**: 120

**Syntax**: =SERIESSUM(6,1,2,{1,2,3,4})

**Result**: 1143510

**Syntax**: =SERIESSUM(2,1,3,{1,1,1,1})

**Result**: 1170

**Syntax**: =SERIESSUM(3,1,1,{1,2,3,4})

**Result**: 426

**Note**: If any argument is nonnumeric, SERIESSUM returns the #VALUE! error value.